Gear-shifting mechanism



H. T. womsomu T GEAR SHIFIING MECHANISM.

APPLICATION HLED JUNE 19, ms.

lA lfiqka mama Nova 1922;,

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of this specification,

Patented Nov. 7, v 1222.

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HARRY T. WOOLSON, or DETRO T, IIIOHIGAN, ASSIGNOR TO PACKARD MOTOR can COMPANY, or DETROIT, MICHIGAN, a CORPORATION or MICHIGAN.

GEAR-SEIFTING MECHANISM.

3 Application filed June 19, 1916. Serial No. 104,438. I

T 0 all whom it may concem:

Be it known that I, HARRY T. WooLsoN, a citizen of the United States, and resident of Detroit, Wayne County, State of Michigan, have invented certain new and useful Improvements in Gear-Shifting Mechanism, of which the following is a specification.

This invention relates to motor vehicles, and particularly to the speed changing gear mechanism and means for controlling the operation thereof.

One of the objects of the invention is to provide an interlocking device for automatically locking one shifter rod positively in neutral position and the other shifter rod yieldingly in gear meshing position.

Another object of the invention is to provide a device to automatically lock both shifter rods yieldingly in neutral position.

Another object of the invention is to provide, in a speed change gear mechanism having two shifter rods, a single unitary means for positively locking either shifter rod in the neutral position while yieldingly looking the other shifting rod in the gear meshing position. 2 Other objects of the invention will appear from the following description taken in connection with the drawings which form a part and in which:

Fig. 1 is a plan view and part section of a gear mechanism embodying one form of the invention;

Fig. 2 is an enlarged transverse section on line 2-2 of Fig. 1 showing one shifter rod in neutral position and the other in gear meshing position;

Fig. 3 is a longitudinalsection mately on line 3 -3 of Fig. 2;

Ti a is a plan view of the rods and locking e ement in the position shown in Fig. 2;

approxi- Fig. 5 is asection taken on the line 5-5 of Fig. 2.

In the drawings 10 designates a speed changing gear mechanism having a clutch or driving shaft 11 and an aligned transmission shaft 12. A lay or countershaft 13 parallel to the shaft 12 is constantly driven by the shaft 11 through the gears 14:. Gears 15, 16 and 17 are fixedly mounted on the lay shaft while gears 18 and 19 are slidab'ly mounted on the transmission shaft being not shown. The gear with teeth 21 which held against rotation on that and ways 20. The gear lS may slide into mesh; directly with the gear 16 and indirect 1y wlth the gear 15 through an idle pinion, 19 may slide into mesh is provided on its hub will mesh with teeth 22 shaft by keys with the gear 17 and on the hub of the when the gear 19 is moved in that direction. The sllding gears 18 and 19 are actuated by arms 23 and 24 fixed on shifter rods 25 and 26 respectively, and the entire mechanism is enclosedrwithin a casing 27. The operation of the speed changing gears is well known and W111 not be described in greater detail. The shifter rods 25 and 26 are supported in parallel in the casing 27 and are provided wlth means for retaining them in neutral and in gear meshing positions. It is desirable that when one rod is in gear or gear meshing positlon, the other rod should be locked positively in neutral position so that it may not he accidentally or otherwise shifted therefrom. The present invention contemplates the use of a single device for so interlocking gear 14 on the shaft 11 the rods and for simultaneously yieldingly 1 locking the shifted rod in its gear meshing position. Tn the construction shown the rods are each provided with spaced grooves 28, 29 and 30, the intermediate groove 29 being deeper than the other grooves and it ma be called the neutral groove while the others mag be called gear position grooves.

t one corner of the casing 27 through which the shifter rods pass is shown a chamber 31, in which are mounted tubes 32 and 33 through which the shifter rods 25 and 26 pass and in which they reciprocate. The upper portion of each tube intermediate the walls of the chamber is cut away as indicated; at 34:. The chamber 31 is closed by a cover plate 35 held in place by nuts and bolts 36 or other suitable means, and on the under side of the cover plate are ears 37 which support a pin 38 of a bar 39 which isset transversely of the rods 25, 26. As shown, the pin is fixed in the bar and turns freel in the ears 37 the openings of which are slig tly elongated vertically to allow lost motion for a purpose hereinafter set forth.

.The lower edge of the bar 39 is beveled to more readily enter and leave the grooves in the shifter rods through the openings 34: in

l the tubes. Springs 40 mounted in pockets in the bar and cover plate bear constantly against the bar and tend to press it downyie dingly locked in neutral position, at

, other times however, that rod, the deep groove of which is engaged by the bar, is positively locked in neutral position while the other rod is yieldingly locked when the bar engages one of the shallow grooves, at which'timethe rod is in the gear meshing position.

The operation of the locking bar will be, most easily understood by a consideration of Figs. 2, 3 and 4, in which the bar 39 is shown. as engagin the shallow groove28 in the rod 25 and the eep groove 29 in the rod 26. The rod 26 is thus positively locked while the rod 25 is yieldingly locked. U on reciprocation of the rod 25 the bar is orced out of the groove 28 and rests on the ungrooved portion of the rod. In this movement of the bar the left end is pivoted on the rod 26 and the pin 38 is raised by reason of the enlarged openings in the ears 37. The rod 26 is positively locked until the rod 25 is returned to the neutral position when the bar will engage the grooves 29 in both rods. Either, but not both, of the rods can then be reciprocated as desired andtheother positively locked in the neutral position.

While only one embodiment of this invention has been shown and described, it is obvious that other forms might be created without going beyond the spirit and scope of this invention as set forth in the following claims. 7 1

Having thus described my invention, what I claim and desire to secure by Letters Patent 1. In. a gear shifting mechanism, in combination, parallel shifter rods, and a single means for positively locking one of saidrods in one position and yieldingly locking the other in another position.

2. In a gear shifting mechanism, in combination, parallel shifter rods, and a single means for positively locking one of said rods in neutral position while yieldingly locking the other'in gear position.

3. In a gear shifting mechanism, in combination, parallel shifter rods, and a pivoted device operated by the rods for positively locking one of said" rods while yieldingly looking the other of said rods. v

4. In a gear shifting mechanism, .in oombination, parallel shifter rods, and a single device for positively locking either of said rods while yieldingly locking the other. 5. In a gear shifting mechanism, in combination, parallel shifter rods having grooves and means operated by the rods and enga ing certain of said grooves for positive y locking one of said. rods while yieldingly locking'the other rod.

6. In a gear shifting mechanism, in combination, parallel shifter rods, each of said rods having grooves of two different de ths, and means engaging the deeper groove 0 one rod and the shallower groove of the other rod for positively locking the first rod while yieldingly locking the'second rod. p

7 Ina gear shifting mechanism, in combination, parallel shifter rods each of said rods having grooves of two different depths, and a single device movable by the rods and engaging thedeeper groove of one rod and the shallower groove of the other rod forv positively locking the first rod while yield- ,ingly locking'the second rod.

'8. In a gear shifting mechanism, in combination, parallel shifter rods each of said rods being provided with grooves of two different depths, and a pivoted bar shiftable by the rods and engaging the deeper grooveof one rod and the shallower groove of the other rod for positively locking the first rod while yieldingly locking the-second rod.

9. In a gear shifting mechanism, in combination, parallel shifter rods each of said rods being provided with grooves, and means shiftable by the rods and engaging certain of said grooves for positively lockone of Said rods in one position while in yi ldingly locking the other-rod in a different relative. position,

10. In a gear shifting mechanism, in combination, parallel shifter rods each. of said rods being provided with grooves of two different. depths, and means shiftable by the rods and engaging the deeper groove of one rod' and the shallower groove of the other rod for positively locking the first rod in one position while yieldingly locking the other rod in a different relative position.

11. In a gear shifter mechanism, in combination, parallel shifter rods, and a bar pivoted transversely of said rods and movable by the rods for positively locking either of said rods while yieldingly locking the other. I.

12. In a gear shiftenmechanism, in combination, parallel shifter rods, and a single means. for simultaneously and yieldingly lockin sai rods in neutral position.

13. n a gear shifter mechanism, in combination, parallel shifter rods, each rod provided with grooves of two difi'erent depths, and. means engaging the deeper groove in each rod for simultaneously and yieldingly locking said rods in neutral position;

14. In a gear shifter mechanism, in combination, parallel shifter rods, each rod provided with grooves of two different depths, and a single device engaging the deeper groove in eachrod for simultaneously and yieldingly locking said rods in neutral position.

15. In a gear shifter mechanism, in combination, parallel shifter rods, each rod provided with grooves of two different depths, and means including a pivoted bar engaging the deeper groove in each rod for simultaneously and yieldingly locking said rods in neutral position.

'16. In a shifting mechanism, in'combination, shifter rods, and means comprising a pivoted bar moved by the rods for positively locking either of said rods while yield ingly locking the other.

17. In a shifting mechanism, in combination, shifter rods, and means comprising a locking bar moved by the rods and adapted to engage both ro'ds, said bar positively locking one of said rods while yieldingly locking the,other. 18. In a shifting mechanism, in combination, shifter rods, and means comprising a locking bar adapted to engage both rods,

said bar pivotally supported between its ends and adapted to pivot adjacent one end on one of the rods to yieldingly lock the other rod.

19. In a shifting mechanism, in combination, shifter rods, a transversely extending locking bar, spring means pressing the looking bar in engagement with both said rods, and means preventing movement of the bar with the rods.

20. In ashifting mechanism, in combination, shifter rods, a transversely extending locking bar pivotally supported between its ends and adapted to engage both said rods, the pivotal support of said bar permitting bodily movement also of the bar, and springs at either end of the bar to press the bar towards the rods. I

21. In a. gear shifting mechanism, in combination, parallel shifter rods, and a pivoted device operated entirely independently of any means for shifting the rods, for positively locking one of said rods while yieldingly locking the other.

22. In a gear shifting mechanism, in combination, parallel shifter rods having grooves, and means operated entirely inde-' pendently of any means for shifting the rods, and engaging certain of said grooves for positively locking one of said rods while yieldingly locking the other rod.

23. In a gear shifting mechanism, in combination, spaced shifter rods, supporting means for said rods, means providing a connecting' space between said rods, and means supported in said space for positively locking one of said rods while yieldingly looking the other rod.

24. In 'a gear shifting mechanism, in combination', spaced parallel shifter rods having locking grooves, a casing in which said rods operate and providing a connecting space between said rods, and means in said conmeeting space cooperating with said grooves for positively locking one of said rods while yieldingly locking the other rod.

In testimony whereof I affix my signature. v w

nnv r. WOOLSON. 

